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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51bbc60076f6fb253b7807de6a0509ba4a98916e337a9fa3decad8c9bebf23ed' 
  AND token = 'SCFapi5Ft8aCBG4WUUjJLnOm4acy8OnVHwoe9krGilc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}